Before a miniature gets its first coat of paint, there is usually some preparation work to do: removing mold lines, smoothing rough edges, and fixing tiny surface imperfections.
Choosing the right sandpaper grit for miniatures makes these steps much easier. With the right grit, you can smooth surfaces, preserve fine details, and create a better foundation for priming and painting.
What Does Sandpaper Grit Mean?
The number printed on sandpaper tells you its grit rating, which indicates how coarse or fine the abrasive surface is. In simple terms, a lower grit number means a rougher surface that removes material faster, while a higher grit number creates a smoother finish.
For miniature preparation, choosing the right grit helps you remove imperfections while protecting fine details.
- Lower grit numbers (around 220–320): More aggressive sanding. Usually reserved for major corrections, such as heavy resin cleanup, large imperfections, or rough 3D print surfaces.
- Medium grit numbers (around 400–600): A common choice for miniature cleanup, including removing mold lines and preparing surfaces before priming.
- Higher grit numbers (800+): Used for refining surfaces, removing light scratches, and creating a smoother finish before painting.
Understanding Different Sandpaper Grit Systems
When shopping for sandpaper, you may notice different rating systems depending on the brand and region.
Many manufacturers use the FEPA scale, which often adds a “P” before the grit number (such as P800). Japanese modeling brands, including those producing sanding tools for plastic models, may use their own standards or JIS-based measurements.
While these systems can vary slightly, the general rule remains the same for miniature painting: lower numbers are coarser, and higher numbers create smoother finishes.
Sandpaper Grit Chart for Miniatures: From Coarse to Fine
Once you understand the basics of sandpaper grit, choosing the right range becomes much easier. The chart below shows the most common sandpaper grits for miniatures and how each one is used during model preparation.
|
Sandpaper Grit |
Level |
Best Use for Miniatures |
|
220-320 grit |
Coarse |
Removing large imperfections, resin supports, and heavy surface marks |
|
400-600 grit |
Medium to Fine |
Removing mold lines, smoothing surfaces, and general cleanup |
|
800-1000 grit |
Very Fine |
Refining surfaces and preparing miniatures before priming |
|
1200+ grit |
Ultra Fine |
Final smoothing and creating an ultra-smooth surface finish |
For most miniature projects, 400-1000 grit is enough for everyday preparation, from mold line removal to final surface smoothing.
What Grit Sandpaper Should You Use for Miniatures?
The best sandpaper grit for miniatures depends on the material you are working with and the level of surface preparation needed. Different materials respond differently to sanding, so choosing the right grit progression helps remove imperfections while protecting fine details.
Plastic Miniatures: 400–1000 Grit Progression
Plastic miniatures are commonly affected by mold lines, sprue marks, and small surface imperfections.
A progression from 400 to 1000 grit works well for most plastic models. Start with 400 grit to remove visible marks, then gradually move through 600, 800, and 1000 grit to smooth sanding scratches and create a clean surface ready for primer.
Tip: For most painted miniatures, 400–1000 grit is enough. Unpainted display models that require a smoother finish may benefit from a finer progression, such as 600–1500 grit.
Resin Miniatures: 600–1500 Grit Progression
Resin miniatures require a more careful approach because the material can be more brittle than plastic and may produce fine dust during sanding.
Starting with 600 grit is usually enough for removing support marks and small surface imperfections. Moving through 800, 1000, and 1500 grit helps refine the surface while preserving sharp details before priming.
For resin models, wet sanding is often a good option, as it helps reduce airborne dust and creates a cleaner sanding process, especially when using finer grits.
3D Printed Miniatures: Adjust Based on Printing Method
The ideal sandpaper grit for 3D printed miniatures depends on the printing technology and the condition of the surface.
- Resin Prints (SLA/LCD): These prints usually have finer details and smaller layer lines. A progression of 600 → 800 → 1000 → 1500 grit works well for smoothing support marks and refining the surface while preserving details.
- Filament Prints (FDM): FDM prints are made from harder plastic materials and are not ideal for sanding.
When sanding resin or 3D printed materials, always work in a well-ventilated area and avoid inhaling fine dust. A dust mask is recommended for extended sanding sessions.
How to Sand Miniatures for a Smooth Surface
Choosing the right grit is only part of the process. Proper sanding technique helps remove imperfections while preserving miniature details and creating a smoother surface for priming.
Start with the Right Grit
Start with the lowest grit needed for the job, then gradually move to finer grits. Using sandpaper that is too coarse can soften sharp edges and remove small sculpted details.
Follow a Gradual Grit Progression
Avoid skipping grit levels during sanding. Moving up gradually allows each stage to remove scratches left by the previous one.
A common progression for miniature preparation is: 400 → 600 → 800 → 1000 grit.
Use Backing Tools for Better Control
For flat surfaces such as armor plates or mechanical details, wrap sandpaper around a sanding stick to maintain sharp edges. Flexible sanding sponges work better for curved or organic surfaces.
Sand Lightly and Check Your Progress
Apply gentle pressure and inspect the surface regularly.
Quick Tip: Lightly mark the surface with a graphite pencil before sanding. If pencil marks remain in small grooves afterward, those areas may need more refinement.
Common Sanding Mistakes When Preparing Miniatures
Even with the right sandpaper grit for miniatures, a few common mistakes can affect the final surface quality.
Using Sandpaper That Is Too Coarse
Very rough sandpaper can remove material quickly, but it may also soften edges and erase small sculpted details such as faces, armor edges, and textures. Use coarse grits only when necessary, and switch to finer grits once major imperfections are corrected.
Skipping Grit Progression
Moving between grits too quickly can leave scratches that become more visible after applying primer. Following a gradual progression, such as 400 → 600 → 800 → 1000 grit, helps create a smoother finish.
Applying Too Much Pressure
Let the abrasive surface do the work. Pressing too hard can flatten sharp edges, soften sculpted details, and create uneven surfaces. Use light pressure, especially when sanding small areas.
Ignoring Surface Checks
Always inspect your miniature from different angles before priming. Small scratches, remaining layer lines, or uneven areas are much easier to fix before paint is applied.
FAQs About Sandpaper Grit for Miniatures
Q1: What grit sandpaper is best for miniatures?
A: There is no single “best” grit for every miniature. For standard plastic miniatures, a 400–600 grit range is a common starting point for removing mold lines, sprue marks, and small imperfections. For resin miniatures and resin 3D prints, starting around 600 grit helps protect delicate details.
Q2: Is 1000-grit sandpaper too fine for miniatures?
A: No. 1000-grit sandpaper is ideal for final surface refinement before priming and painting. It helps smooth out fine scratches left by coarser grits while preserving sculpted details.
Q3: Can I use regular sandpaper on resin miniatures?
A: Yes. Standard hobby sandpaper or sanding sponges work well on resin models. However, resin requires lighter pressure, and wet sanding can help reduce fine resin dust during cleanup.
Q4: Should I wet sand my miniatures?
A: Wet sanding is especially useful for resin models and final surface refinement. Water helps prevent abrasive clogging, reduces friction, and keeps dust under control. Always use waterproof (wet/dry) sandpaper when wet sanding.
Q5: What does the “P” mean on sandpaper grit labels?
A: The “P” indicates the FEPA grit standard, which is widely used for many hobby abrasives. Different grading systems, such as FEPA, JIS, and CAMI, may vary slightly, so check the standard when comparing sandpaper from different brands.
From Rough Surfaces to Ready-to-Paint Details
Every great paint job starts before the first brushstroke. Choosing the right sandpaper grit for miniatures helps create a smoother surface and a better foundation for primer and paint.
Ready for the next step? Explore our complete guide to painting miniatures for tips on taking your model from preparation to finished details.
